Forced FILM and IVTC?

[NetSoerfer]

Hi,

I'm still trying to encode "The Fast and the Furious", and i still don't get it... :-(
i managed to successfully start the encoding process with virtualdub, but ran into some problem ("couldn't open frame XX" or so, sorry, don't have the error message as i closed the window too quickly), but that's another thing for another forum.
i read about ivtc, not only here, but also on the dvd2avi homepage and got some things i didn't understand.
interlaced picture comes from transforming a 24fps movie to 29.97fps, right? so, if i want to deinterlace the movie with ivtc, i need the original 29.97fps source. but when i switch on forced FILM in dvd2avi, it says the video type is 23.976fps.
so, if i save the project with forced FILM switched on, dvd2avi saves the d2v with 23.976fps, at least that's what i understood.
but how can i deinterlace the film, if dvd2avi has already "stolen" 20% of the frames?
sorry, but i really don't get it...

soerfer

[Kedirekin]

29.97 vs 23.97, NTSC vs FILM, and progressive vs interlaced vs telecined is very confusing. I think it took me the better part of 4 months before I really felt like I new what it was all about.

I can't do a better job of explaining things than has already been done elsewhere, so I won't try. I will direct you to what I feel are some very good explanations though (assuming you haven't already seen them).

Interlacing - Lukes Video Guide (http://www.geocities.com/lukesvideo/interlacing.html)

and

Telecining - Luke's Video Guide (http://www.geocities.com/lukesvideo/telecining.html)

[Kedirekin]

Oh, and to give you a more direct answer to some of your questions...

Preview (or save) the project in dvd2avi with the stats window open.

If, at the end, the stats window says 95% FILM or better (or if it just says FILM, which means 100% FILM, or if it says less than 5% NTSC), you'll probably want to turn Force Film on. Then you won't need to spend the time doing IVTC (Force Film is a sort-of quick and sometimes dirty form of IVTC). You may want to use a smart interlace filter like SmartDeinterlacer or Decomb's FieldDeinterlacer to catch the few combed frames that sneak through (that the sometimes dirty part).

If the stats window says less than 95% FILM (or greater than 5% NTSC, or if it says just NTSC, which means 0% FILM), you'll want to set dvd2avi to None. Then you'll need to look at the video frame-by-frame to determine if it is telecined or just plain 29.97 fps interlaced (or more rarely, 29.97 fps progressive - but that's extremely rare). Only use IVTC if the video looks like it was telecined. Again, I refer you back to Luke's guides to help you determine all of this.

[NetSoerfer]

Yeah...

I'll read through Luke's Guides, thanks a lot.
I tried Forced FILM, VirtualDub gave me an error at the point where (i guess) the vob ID changed from 1 XX to 2 XX. It just stopped encoding the first pass there and went over to the second pass. I quit. Then I created a new d2v with DVD2AVI set to None and ivtc'd it with TMPGEnc manually. The pattern changed once, but when I Checked, TMPGEnc told me there was an error at another frame - the pattern simply didn't match there, so I had to manually set it to the pattern I had found out before (I don't know why at that frame TMPGEnc didn't use the pattern I told it to). Then it worked - the job's just finished while I'm writing this.
Strange enough for me to not understand what's happened - whatever, it seems to have worked.

Gotta say - the video looks much better than with XMpeg, though I don't think I've reached the optimum (as I've used VirtualDub for the first time now).

Once again to Forced FILM and IVTC:
You can always use IVTC, it's just that you save time when using Forced FILM, right?

Thanks a lot, I guess now I'm on the right way to understand the basics of encoding ;-)

see ya...

soerfer